EP1314877A2 - Kolbenkühlungsrippe - Google Patents

Kolbenkühlungsrippe Download PDF

Info

Publication number
EP1314877A2
EP1314877A2 EP02019253A EP02019253A EP1314877A2 EP 1314877 A2 EP1314877 A2 EP 1314877A2 EP 02019253 A EP02019253 A EP 02019253A EP 02019253 A EP02019253 A EP 02019253A EP 1314877 A2 EP1314877 A2 EP 1314877A2
Authority
EP
European Patent Office
Prior art keywords
piston
annular
fin
wall
annular fin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02019253A
Other languages
English (en)
French (fr)
Other versions
EP1314877A3 (de
Inventor
Cornelius N. Caterpillar Inc. Opris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Inc filed Critical Caterpillar Inc
Publication of EP1314877A2 publication Critical patent/EP1314877A2/de
Publication of EP1314877A3 publication Critical patent/EP1314877A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/20—Multi-cylinder engines with cylinders all in one line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1824—Number of cylinders six
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons

Definitions

  • This invention relates generally to an engine and more particularly to the cooling of a piston by placing a fin within a cooling recess of the piston.
  • a method of increasing the contact between the oil and the interior of the piston is by increasing the surface area of the interior of the piston, thereby providing more area for the oil to contact and absorb heat.
  • U.S. patent 2,523,699 issued to G.A. Holt et al. on 26 September 1950 shows a series of ribs projecting inwardly from the interior wall of the piston skirt. These ribs increase the heat dissipating area of the piston that is in contact with the oil as the oil is shaken by the reciprocating motion of the piston.
  • the intricate piston design set forth in Holt is very difficult to produce via forging or machining processes. Therefore, the piston disclosed in Holt is practical for use solely in casting processes. However, the casting process introduces impurities into the cast product. These impurities decrease the density of the product and thus decrease the product's resistance to deformation at high temperatures and pressures.
  • the present invention is directed to overcoming one or more of the problems as set forth above.
  • a piston has a top portion having a bowl and a periphery portion.
  • the bowl has an annular bowl that is attached to and extends radially inward from the periphery portion.
  • Each of the annular bowl and the periphery portion has an inner surface.
  • the piston has an outer annular wall that extends axially from the periphery portion of the top portion of the piston.
  • the outer annular wall has an inner surface.
  • the annular bowl inner surface, the periphery portion inner surface, and the outer annular wall inner surface define a cooling gallery.
  • the piston has at least one annular fin that extends from the cooling gallery.
  • a method of creating a piston includes providing a piston having a top portion and an outer annular wall as described above and introducing to the cooling gallery at least one annular fin.
  • the engine 10 includes a cylinder block 12, a cylinder head 14 attached to the block 12, a valve cover 16 attached to the head 14, and a cooling system (not shown). These components are of a generally conventional design.
  • the block 12 includes a top mounting surface 18, a bottom mounting surface 20, and a plurality of cylinder bores 22 located between the top mounting surface 18 and the bottom mounting surface 20.
  • six cylinder bores 22 are equally spaced, in-line, and perpendicularly positioned with respect to the top mounting surface 18.
  • the cylinder block 12 may be of any other conventional design, such as "V" or radial, and may have any number of bores 22.
  • each bore 22 defines a cylinder wall 24.
  • a cylinder liner is placed in the bore 22 to form the cylinder wall 24.
  • the apparatus and method described in the present application may be used in engines that do not contain cylinder liners.
  • the cylinder block 12 has a plurality of interconnected passages (not shown) to enable the flow of a lubricating and/or cooling medium, such as oil (not shown).
  • a lubricating and/or cooling medium such as oil (not shown).
  • Secured to the block 12 and connected to the cooling passages are a plurality of coolant directing nozzles 26.
  • the block 12 also has an oil pan 28, shown in Fig. 1, connected to the block 12.
  • a piston 34 is slidably positioned within the cylinder wall 24 of the cylinder block 12.
  • the piston 34, the cylinder wall 24, and the cylinder head 14 define a combustion zone 36.
  • the piston 34 is a generally cylindrical structure having a top portion 38 and a pin portion 40.
  • the piston 34 is shown as one piece.
  • the piston 34 may be any conventional piston type, including an articulated piston or a composite piston.
  • the top portion 38 is further defined by a bowl 42, a periphery portion 44, and an outer annular wall 46.
  • the bowl 42 is defined by an annular bowl 48 connected with the periphery portion 44.
  • the annular bowl extends radially inward from the periphery portion 44 and connects to a conical section 50 forming an apex.
  • the annular bowl 48 has an inner surface 52 separated from the combustion zone 36.
  • the periphery portion 44, the annular bowl 48, and the conical section 50 are integrally formed. As shown in Fig. 2, the distance from the apex of the conical section 50 to the cylinder head 14 is generally greater than the distance from the periphery portion 44 to the cylinder head 14.
  • the periphery portion 44 extends radially away from the bowl 42 towards the cylinder wall 24.
  • the outer annular wall 46 extends axially away from the periphery portion 44 towards the pin portion 40.
  • the outer annular wall 46 has an inner surface 54 and an outer surface 56.
  • the periphery portion 44 has an inner surface 58 that is separated from the combustion zone 36.
  • the periphery portion inner surface 58 is connected to, and integral with, the inner surface 52 of the annular bowl 48 and the inner surface 54 of the outer annular wall 46.
  • the inner surface 58 of the periphery portion 44, the inner surface 52 of the annular bowl 48, and the inner surface 54 of the outer annular wall 46 define a crown interior surface 59.
  • the outer surface 56 has a sealing portion 60 in which any conventional manner of providing sealing between the piston 34 and the cylinder wall 24, such as a plurality of piston rings 62, can be formed.
  • annular groove 64 is located in the crown interior surface 59.
  • the annular groove 64 has an inner wall 66 and an outer wall 68.
  • One or both of the inner wall 66 and the outer wall 68 may have a thread 70 formed thereon.
  • annular fin 72 is attached to one or both of the inner wall 66 and the outer wall 68 of the annular groove 64.
  • the annular fin 72 has an inner surface 74, an outer surface 76, a first edge 78, and a second edge 80.
  • One or both of the outer surface 76 and the inner surface 74 may have a thread 82 formed thereon.
  • annular fin 72 The location and dimensions of the annular fin 72, including diameter, thickness, and length, are predetermined.
  • the annular fin 72 is integrally formed with the crown interior surface 59.
  • a plurality of the annular fins 72 may be attached to, or integral with, the crown interior surface 59.
  • a baffle plate 84 is connected between a lip portion 86 on the inner surface 52 of the annular bowl 48 and a lower edge portion 88 of the inner surface 54 of the outer annular wall 46.
  • the baffle plate 84 has a receiving aperture 90 therethrough and a draining aperture 92, shown in Fig. 3, therethrough.
  • the baffle plate 84, the crown interior surface 59, the inner surface 74 of the annular fin 72, the first edge 78 of the annular fin 72, and the outer surface 76 of the annular fin 72 define a cooling gallery 94.
  • a baffle plate is not present.
  • the annular fin 72 may be defined by a plurality of fin segments 96, as shown in Fig. 8.
  • the location and dimensions of the annular fin 72 are determined by examining various factors.
  • One primary factor is the location in the piston 34 from which heat needs to be dissipated. For example, if the temperature of the annular bowl 48 of the piston 34 needs to be reduced, the diameter of the annular fin 72 may be selected to ensure that the annular fin 72 will contact the area of the inner surface 52 of the annular bowl 48 that will effect the proper heat reduction.
  • Another factor affecting the annular fin 72 dimensions is the magnitude of the heat that is to be evacuated from the piston 34. An annular fin 72 with a larger surface area will draw more heat from the piston 34. In addition, a thin annular fin 72 will dissipate more heat than a thick one.
  • the amount of stress placed upon the piston 34 by the introduction of the annular fin 72 is another factor that influences the annular fin's location and dimensions.
  • the physical dimensions of the piston 34 itself also affect the size and location of the annular fin 72. If the piston contains the baffle 84, the optimal dimensions of the annular fin 72 will depend upon the size of the enclosed cooling gallery 94.
  • the size of the annular fin 72 and the angle at which it protrudes from the crown interior surface 59 may be modified to ensure that the annular fin 72 does not excessively impede the flow of the cooling medium to other portions of the crown interior surface 59 and thereby detrimentally affect the cooling of the piston 34.
  • One method of attaching the annular fin 72 to the crown interior surface 59 of the piston 34 includes inserting the second edge 80 of the annular fin 72 into the annular groove 64, creating a press-fit connection between the inner surface 74 and outer surface 76 of the annular fin 72 and the inner wall 66 and outer wall 68 of the annular groove 64.
  • Another method is used for embodiments of the piston 34 containing thread 82 on the annular fin 72 or thread 70 in the annular groove 64.
  • the second edge 80 of the annular fin 72 is placed in the annular groove 64 and the fin 72 is threaded into the groove 64, thereby connecting the annular fin 72 to the piston 34.
  • Both of these methods may be used with pistons of any type, including cast, forged, composite, and mechanically joined, as the annular groove 64 may be easily and expeditiously machined into the crown interior surface 59 of any piston 34.
  • FIG. 5 Another method of the present application, shown in Fig. 5, consists of creating the annular fin 72 as an integral part of the piston 34.
  • the annular fin 72 In the process of machining the piston 34 and creating the crown interior surface 59, the annular fin 72, containing the inner surface 74, the outer surface 76, and the first edge 78, that extends from the crown interior surface 59 and that is integral with the piston 34 is formed.
  • This method may be practiced with forged pistons by simply altering the machining process currently used to create the crown interior surface 59 of forged pistons 34.
  • the annular fin 72 may also be made integral with the piston 34 via a method that includes inertial welding.
  • a method that includes inertial welding either the annular fin 72, the piston 34, or both, are rotated at high velocity. If both are rotated, they are typically rotated in opposite directions.
  • the annular fin 72 and the piston 34 are then brought together quickly with the annular fin 72 contacting the crown interior surface 59 at the predetermined location. The heat created by the friction between the annular fin 72 and the piston 34 welds them together, making the fin 72 integral with the piston 34.
  • the addition of the annular fin 72 to the crown interior surface 59 of the piston 34 effects heat attenuation of the portions of the piston 34 that are subject to the highest temperatures and pressures.
  • a cooling medium such as oil, flows through the cooling passages of the engine 10. The cooling medium is sprayed by the coolant directing nozzle 26 onto the crown interior surface 59 of the piston 34. If the piston 34 has the baffle 84, the cooling medium enters the cooling gallery 94 through the receiving aperture 90 and contacts the crown interior surface 59 and the annular fin 72. The cooling medium absorbs heat from the crown interior surface 59 and the annular fin 72. This absorption of heat is greater than that in a piston 34 without an annular fin 72 because the annular fin 72 increases the surface area for the cooling medium to contact the piston 34.
  • the annular fin's 72 position in the crown interior surface 59 allows the annular fin 72 to draw heat from a specific area of the piston 34.
  • the baffle 84 retains the cooling medium in the cooling gallery 94, causing the cooling medium to absorb more heat from the crown interior surface 59 as the oil is repeatedly brought into contact with the annular fin 72 and the crown interior surface 59 by the reciprocating motion of the piston 34.
  • the cooling medium exits the cooling gallery 94 through the draining aperture 92. After exiting the cooling gallery 94, the cooling medium enters the oil pan 28 and is recirculated through the engine 10 and cooled by the engine cooling system in a conventional manner.
  • the cooling medium is simply sprayed directly onto the crown interior surface 59 and the annular fin 72.
  • the cooling medium then absorbs heat from the crown interior surface 59 and the annular fin 72 and falls back into the oil pan 28.
  • the cooling medium is then recirculated through the engine 10 and cooled by the engine cooling system in the conventional manner.
  • the apparatus and method of the present application solves many problems.
  • the apparatus and method may be used in any type of piston, including cast, forged, composite, and mechanically joined.
  • the apparatus may be quickly and easily installed, decreasing manufacturing costs.
  • the adjustable dimensions and location of the apparatus permit the specific targeting of areas in the piston from which heat is to be removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP02019253A 2001-11-27 2002-08-28 Kolbenkühlungsrippe Withdrawn EP1314877A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US995566 2001-11-27
US09/995,566 US6532913B1 (en) 2001-11-27 2001-11-27 Piston cooling fin

Publications (2)

Publication Number Publication Date
EP1314877A2 true EP1314877A2 (de) 2003-05-28
EP1314877A3 EP1314877A3 (de) 2003-09-10

Family

ID=25541950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02019253A Withdrawn EP1314877A3 (de) 2001-11-27 2002-08-28 Kolbenkühlungsrippe

Country Status (3)

Country Link
US (1) US6532913B1 (de)
EP (1) EP1314877A3 (de)
JP (1) JP2003214253A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007050214A1 (de) * 2007-10-20 2009-04-23 Mahle International Gmbh Kolben für einen Verbrennungsmotor
WO2018184895A1 (de) * 2017-04-05 2018-10-11 Mahle International Gmbh Kolben einer brennkraftmaschine

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6868817B2 (en) * 2002-12-13 2005-03-22 International Engine Intellectual Property Company, Llc Simplified combustion chamber
DE102004019011A1 (de) * 2004-04-20 2005-11-17 Mahle Gmbh Kühlkanalabdeckung für einen Kolben eines Verbrennungsmotors
DE102004043720A1 (de) * 2004-09-09 2006-03-30 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor sowie Verbrennungsmotor
US20070074695A1 (en) * 2005-10-04 2007-04-05 Mahle Technology, Inc. Piston having improved cooling characteristics
US7299772B1 (en) * 2006-06-22 2007-11-27 Caterpillar Inc. Cooling gallery fan assembly for a piston
DE102007050213A1 (de) * 2007-10-20 2009-04-23 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102010056220A1 (de) * 2010-12-24 2012-06-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102011115826A1 (de) * 2011-10-13 2013-04-18 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102012211440A1 (de) 2011-10-21 2013-04-25 Mahle International Gmbh Kolben
DE102011119527A1 (de) * 2011-11-26 2013-05-29 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
DE102012014188A1 (de) * 2012-07-18 2014-01-23 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102012014193A1 (de) * 2012-07-18 2014-05-15 Mahle International Gmbh Kolben für einen Verbrennungsmotor
US9404439B2 (en) * 2012-10-12 2016-08-02 Mahle International Gmbh Piston with cooling gallery and cooling gallery fins
US10240556B2 (en) 2015-01-30 2019-03-26 Tenneco Inc. Piston with cooling gallery cooling insert and method of construction thereof
DE102016001926A1 (de) 2016-02-18 2017-08-24 Man Truck & Bus Ag Kolben für eine Hubkolben-Verbrennungskraftmaschine
US10724516B2 (en) * 2017-06-13 2020-07-28 Forum Us, Inc. Reciprocating piston
DE102019215486A1 (de) * 2019-10-09 2021-04-15 Mahle International Gmbh Kolben für eine Brennkraftmaschine
CN114278455B (zh) * 2020-09-27 2023-12-19 马勒汽车技术（中国）有限公司 具有分流式内冷流道的活塞

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2046196A (en) * 1935-01-19 1936-06-30 Gen Motors Corp Piston
US3136306A (en) * 1961-04-20 1964-06-09 Stevens Inst Technology Piston for a high performance internal combustion engine
GB1028517A (en) * 1963-12-06 1966-05-04 Blackstone & Co Ltd Improvements in or relating to an internal combustion engine and a piston for such an engine
FR1450255A (fr) * 1965-10-18 1966-05-06 Mahle Kg Piston pour moteurs à combustion interne
US4368697A (en) * 1980-03-05 1983-01-18 Karl Schmidt Gmbh Liquid-cooled piston for internal combustion engines
US5052280A (en) * 1986-12-17 1991-10-01 Mahle Gmbh Coolable trunk piston for internal combustion engines

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1628652A (en) 1921-01-28 1927-05-17 Charles A Carlson Piston construction
US2523699A (en) 1946-08-21 1950-09-26 Harry Ralph Ricardo Piston
US2463025A (en) 1947-11-13 1949-03-01 Gen Motors Corp Piston
US2609799A (en) 1949-02-10 1952-09-09 Gen Motors Corp Engine cooling and lubricating system
US2991769A (en) * 1959-04-27 1961-07-11 Gen Motors Corp Piston and piston cooling means
AU503148B2 (en) 1975-06-16 1979-08-23 Cummins Engine Company, Inc Piston with flexible heat dam
DE2723619C2 (de) 1977-05-25 1984-10-04 Karl Schmidt Gmbh, 7107 Neckarsulm Mehrteiliger, flüssigkeitsgekühlter Kolben für Brennkraftmaschinen
DE3403624A1 (de) 1984-02-02 1985-08-08 Kolbenschmidt AG, 7107 Neckarsulm Gebauter, fluessigkeitsgekuehlter kolben fuer brennkraftmaschinen
BR9005376A (pt) 1990-10-18 1992-06-16 Metal Leve Sa Embolo bipartido com fechamento postico de galeria e processo para sua obtencao

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2046196A (en) * 1935-01-19 1936-06-30 Gen Motors Corp Piston
US3136306A (en) * 1961-04-20 1964-06-09 Stevens Inst Technology Piston for a high performance internal combustion engine
GB1028517A (en) * 1963-12-06 1966-05-04 Blackstone & Co Ltd Improvements in or relating to an internal combustion engine and a piston for such an engine
FR1450255A (fr) * 1965-10-18 1966-05-06 Mahle Kg Piston pour moteurs à combustion interne
US4368697A (en) * 1980-03-05 1983-01-18 Karl Schmidt Gmbh Liquid-cooled piston for internal combustion engines
US5052280A (en) * 1986-12-17 1991-10-01 Mahle Gmbh Coolable trunk piston for internal combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007050214A1 (de) * 2007-10-20 2009-04-23 Mahle International Gmbh Kolben für einen Verbrennungsmotor
WO2018184895A1 (de) * 2017-04-05 2018-10-11 Mahle International Gmbh Kolben einer brennkraftmaschine

Also Published As

Publication number Publication date
US6532913B1 (en) 2003-03-18
JP2003214253A (ja) 2003-07-30
EP1314877A3 (de) 2003-09-10

Similar Documents

Publication Publication Date Title
US6532913B1 (en) Piston cooling fin
US7299772B1 (en) Cooling gallery fan assembly for a piston
US4907545A (en) Liquid cooled piston ring carrier assembly and piston using same
US10450999B2 (en) Reduced compression height dual gallery piston, piston assembly therewith and methods of construction thereof
US4377967A (en) Two-piece piston assembly
JP2703081B2 (ja) エンジンピストン組立体及び冷却凹部を有する鍛造ピストン部材
US4517930A (en) Piston of combustion engine
US6499386B2 (en) Liquid-cooled piston
US5934174A (en) Lightweight articulated piston head and method of making the piston head
US10359000B2 (en) Functionally optimized design of a cylinder liner
US9797337B2 (en) Oil-cooled piston for an internal combustion engine
US7240643B1 (en) Piston cooling nozzle and positioning method for an internal combustion engine
US10428761B2 (en) Galleryless piston with improved pocket cooling
US9771891B2 (en) Piston for an internal combustion engine
US6634278B2 (en) Piston for an internal combustion engine and method of assembly
JPS60192860A (ja) 内燃機関用ピストン
US10704491B2 (en) Piston cooling gallery shaping to reduce piston temperature
US5839352A (en) Articulated piston
US6840156B1 (en) Piston with cast-in undercrown pins for increased heat dissipation
US4542719A (en) Engine cooling system
US20170211459A1 (en) Piston with cooling gallery radiator and method of construction thereof
US10731598B2 (en) Piston having an undercrown surface with coating and method of manufacture thereof
US20170254290A1 (en) Galleryless piston with connection to pockets
JPH0291452A (ja) ２ピースピストン
JPH0333459A (ja) 内燃機関のピストン

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

RIC1 Information provided on ipc code assigned before grant

Ipc: 7F 02F 3/22 B

Ipc: 7F 02F 3/20 A

AKX Designation fees paid

Designated state(s): DE GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20040311